Originally Posted by greenscape
...Of course the other side of that is, because this engine uses synthetic oil that lubricates at such a high level, is it just as important to leave it in to ensure the parts do break in correctly???? That I think is the answer we are looking for..
The answer is no. Issues are created when you switch your new car original oil(not synthetic) out with only a couple thousand miles and replace it with synthetic. What happens is the rings never have a chance to develope a nice seal. With BMW, the engine is designed from the start to use synthetic so it's not a problem.